| Title | Physicochemical properties of Pyr13TFSI-NaTFSI electrolyte for sodium batteries |
|---|---|
| Publication Type | Articolo su Rivista peer-reviewed |
| Year of Publication | 2022 |
| Authors | Stigliano, P., Ferrara C., Pianta N., Gentile A., Mezzomo L., Lorenzi R., Berbenni V., Ruffo R., Appetecchi Giovanni Battista, and Mustarelli P. |
| Journal | Electrochimica Acta |
| Volume | 412 |
| ISSN | 00134686 |
| Keywords | Bis(trifluoromethane sulfonyl)imide, Concentration ranges, Electrolytes, Ionic liquids, Lithium, Lithium batteries, Manganese compounds, Molefraction, N-propyl, Na+ ions, Negative ions, Nuclear magnetic resonance spectroscopy, Physicochemical properties, Physicochemical property, Sodium, Sodium battery, Sodium compounds, Sodium salt, Solid state NMR, Transport |
| Abstract | {Ionic liquids (ILs) are an increasingly important component of electrolytes for lithium and sodium batteries. Here, the physicochemical properties of the system N-propyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr13TFSI) ionic liquid and NaTFSI are investigated vs. the concentration of the sodium salt and the temperature. The explored concentration range was (1-x) Pyr13TFSI: x NaTFSI with x (mole fraction) = 0, 0.02, 0.05, 0.1, 0.2. 23Na solid-state NMR reveals that the Na+ ions exist in two distinct environments: mobile Na+ ions (1), and Na+ ions involved in clusters or even bigger interacting networks (2). The ratio between mobile and bonded Na+ populations increases with temperature and decreases with increasing salt concentration, reaching 100% at 60 °C for the most diluted compositions. Raman spectroscopy allows to identify the quantity of free and bonded anions depending on the concentration, and to measure the number of Na+ ions solvating the TFSI− anion (SN = 4). The combined NMR and Raman results allow us to estimate the salt solubility range |
| Notes | cited By 0 |
| URL | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85125664688&doi=10.1016%2fj.electacta.2022.140123&partnerID=40&md5=5f41c5159c2fd04a3a2b076d7b01be39 |
| DOI | 10.1016/j.electacta.2022.140123 |
| Citation Key | Stigliano2022 |
